Here¹s what I can find... Dermot: ³Diarmaid, signifying the god of arms, is derived from ³Dia², a god, and ³Armaid², the ...plural of ³Arm². ....This name is Anglicised ³Diarmot² and has become a surname, as MacDermott². The only thing I could find that seems like Jeremiah (phonetically) is this: ³Gearrmaide, derived from ³Gearr, short, and ³maide², a stick; signifying the chief of the short cudgel. Bart with a period (Bart.) is short for Baronet, but Bart by itself is short for Bartholemew. Hope this helps!